PNaCl: Add a vector type legalization pass.

lib/Transforms/NaCl/PNaClABISimplify.cpp

Index: lib/Transforms/NaCl/PNaClABISimplify.cpp
diff --git a/lib/Transforms/NaCl/PNaClABISimplify.cpp b/lib/Transforms/NaCl/PNaClABISimplify.cpp
index 1dac32cde83b7fa53a242afdfc3a00d826438f7f..7c1857b1da855ac4d6ee96720ec3f6a35b142aca 100644
--- a/lib/Transforms/NaCl/PNaClABISimplify.cpp
+++ b/lib/Transforms/NaCl/PNaClABISimplify.cpp
@@ -123,6 +123,8 @@ void llvm::PNaClABISimplifyAddPreOptPasses(Triple *T, PassManagerBase &PM) {
 void llvm::PNaClABISimplifyAddPostOptPasses(Triple *T, PassManagerBase &PM) {
   bool isEmscripten = T->isOSEmscripten();
 
+  PM.add(createPNaClVectorCanonicalizationPass());
+
   if (!isEmscripten) // setjmp/longjmp are handled in LowerEmSetjmp,
                      // memcpy/memmove/memset are handled in JSBackend.
     PM.add(createRewritePNaClLibraryCallsPass());